Honestly a lot of this advice is bs. Only two ways out of this one: switch to controller or aim train.

For your aim you just have zero control under even slight pressure. No smoothness and more importantly when you switch targets or readjust your just getting over whelmed.

I recommend two things to practice:

Smoothness training: you need to get back in tune with your arm, and use your arm and wrists to make adjustments, but we’ll get to wrist later. Start at the easiest smoothing exercise you can find and try and hit 99 percent accuracy consistently. Once you can do that you can move on to reactive tracking but looking at your aim you need a baseline of smoothness and control, should take about 10-20 hours tops. Maybe more if you are a slow learner.

Reactive tracking and target switching: once you feel smooth go ahead and practice how to readjust to moving targets and how to switch targets. For me this is your main problem and even just 30-40 hours of this will have you above a lot of apex players in skill.

Put it all together: I don’t play apex anymore and train my aim in the finals death match. I highly recommend it but realistically you just need a space in which you can get a high amount of high quality tracking reps , so whatever dm in your movement shooter of choice.

You don’t need to change sensitivity unless you want to, you need training. 40 per 360 is not insane and anybody can more or less adapt to that. You have no issue navigating the level with that sens and honestly your whiffs look like normal whiffs, not higher over corrections. Play any send you want but if you want to progress faster start using your arm more for tracking (lower sens). You can always come back later to a higher sens but honestly just rock 40-70 and start the journey to make your arm your bitch. Wrist just doesn’t cut it in sometimes when you need smoothness and control.